The endocannabinoid system is spread throughout your brain and body, but primarily throughout your central nervous system. The interaction between cannabinoids and receptors is what produces effects like the regulation of mood, pain, appetite, inflammation, and memory. Plant-based cannabinoids, found in cannabis plants, also interact with the receptors (whimsically named CB1 and CB2) in the endocannabinoid system, and each affects your body in different ways. CBD and its infamous cousin THC are the 2 most well-known cannabinoids.
Realistically, you’re going to be looking at a minimum dose of about 40mg CBD if you want to feel effects, at least that’s in my experience. That said, I’ve noticed that dosing can be kind of sensitive – if I take over about 80mg, it seems to start effecting me negatively while a 40-50 mg dose works wonders for me joint pain and sleep. Just my two cents. Best of luck